Build an HTTPS Service

To help you ensure data confidentiality, you can deploy your Mule app using an HTTPS-based service. Learn how to build:

  • An HTTPS service to deploy your application to CloudHub

  • HTTPS services using API Manager proxies

Additionally, learn how to configure HTTP request and response headers.

If you need to deploy your app locally, see TLS Configuration.


Before you begin, build a service (such as a simple "Hello World" service) and deploy it.
Learn how to design and develop an API using our Build an API from Start to Finish tutorial.

Build an HTTPS Service

Modify your service to HTTPS to deploy your app to CloudHub:

  1. Generate a keystore.jks file using the JDK keytool utility on the command line. You must also specify the hostname on the command line to generate a self-signed certificate.

    For example, the following command with hostname SAN=DNS:localhost,IP: creates a keystore.jks file:

    keytool -genkeypair -keystore keystore.jks   -dname "CN=localhost, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown"  -keypass password  -storepass password  -keyalg RSA  -sigalg SHA1withRSA  -keysize 2048  -alias mule  -ext SAN=DNS:localhost,IP: -validity 9999
  2. Add the generated keystore.jks file to your Anypoint Studio Mule app folder in src/main/resources.

  3. Configure the HTTP Listener in your Mule app, specifying:

    • Any host IP addresses you want to use with the HTTPS scheme for the value of host

    • A value for ${https.port} variable for the value of `port

<http:listener-config name="HTTPS_Listener_Configuration" protocol="HTTPS" host="" port="${https.port}">
         <tls:key-store path="keystore.jks" keyPassword="${keystore.password}" password="${password}"/>
  1. Include a config-ref reference to the HTTPS global listener configuration.

<flow name="httpsserviceFlow">
    <http:listener config-ref="HTTPS_Listener_Configuration" path="hello"/>
  1. Configure the HTTP Requester using the TLS configuration required to enable HTTPS requests to external addresses:

    <http:request-config name="HTTP_Request_Configuration" protocol="HTTPS" host="" port="${https.port}" >
             <tls:key-store path="keystore.jks" password="${password}" keyPassword="${keystore.password}" />
  1. Include a config-ref reference to the HTTPS global request configuration:

    <flow name="httpsserviceFlow">
      <http:request config-ref="HTTP_Request_Configuration" path="some-path" method="GET" host="" port="${https.port}"/>

    Your application is now ready to be deployed on CloudHub. You can access your endpoint using the HTTPS address: for example, https://yourdomain.cloudhub.io

Configure Services Under API Manager Proxies

If you are prompted to download a proxy from API Manager and need to configure it for HTTPS, follow the same steps that you used in Anypoint Connector for HTTP to configure the HTTP Requester. The HTTP Listener configuration is provided as a template.

To complete the configuration:

  1. Import the proxy project into Anypoint Studio.

  2. Select the Configuration XML tab for your proxy flow.

    The parser detects an error because the flow references an HTTPS Connector that is commented out.

  3. Uncomment the http:listener-config block.

  4. Add the keystore values: path, password, and keyPassword:

    <tls:context name="tls-context-config">
        <tls:key-store path="keystore.jks" password="${password}"
    • You can use external properties.

    • The value of path cannot include src/main/resources.

      Your configuration should look similar to the following:

      <?xml version="1.0" encoding="UTF-8"?>
      <mule xmlns:api-platform-gw="http://www.mulesoft.org/schema/mule/api-platform-gw"
      	xmlns:tls="http://www.mulesoft.org/schema/mule/tls" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
      http://www.mulesoft.org/schema/mule/api-platform-gw http://www.mulesoft.org/schema/mule/api-platform-gw/current/mule-api-platform-gw.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
      http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
      http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
      http://www.mulesoft.org/schema/mule/tls http://www.mulesoft.org/schema/mule/tls/current/mule-tls.xsd">
            <configuration defaultProcessingStrategy="non-blocking" />
          <expression-language:property-placeholder location="config.properties" />
          <api-platform-gw:api apiName="![p['api.name']]" version="![p['api.version']]" flowRef="proxy">
          <http:listener-config name="https-lc-" host="" port="![p['proxy.port']]" protocol="HTTPS">
              <tls:context name="tls-context-config">
                  <tls:key-store path="keystore.jks" password="${password}"

Configure HTTP Request and Response Headers

You can change the maximum values for the server response headers, server request headers, and client request headers by modifying the following system properties in the wrapper.conf file:

Name Property Description Default Value

Server Response Headers


Maximum amount of headers allowed on a response sent from the HTTP server.


Server Request Headers


Maximum amount of headers allowed on a request sent to the HTTP server.


Client Request Headers


Maximum amount of headers allowed on a request sent by the HTTP client.


There is no such Max Client Response Header system property as there is no maximum limit for client HTTP response headers.

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